Feature Request #2370
review real sprite compression type
See http://www.tt-forums.net/viewtopic.php?p=666637#p666637 for a good description by frosch
Probably best course of action: only keep ALLOW_CROP. Try both TILE and COMPRESSION and see which one results in the smallest filesize. For OpenTTD it doesn't matter at all, for TTDPatch it might have some speed implications. Personally I don't care about the possible small performance penalty in TTDPatch for this case.
- frosch123 is surprised nml exposes the real sprite compression type
<Yexo> frosch123: it's needed to set "no-crop" for some sprites
<frosch123> btw. TILE | COMPRESSED is no valid combination, but ottd ignores COMPRESSED anyway
<Yexo> or you wouldn't be able to crop sprites at all
<frosch123> yes, CROP is important :)
<Yexo> openttd tries to load all sprites as if they are compressed?
<frosch123> ottd loads all sprites on first use, and stores them uncompressed in the spritecache
<frosch123> TILE and NORMAL are ignored as well (except for actually reading)
<frosch123> the simple blitters more or less user NORMAL for all sprites, while the optimised blitters use something like TILE for all
<frosch123> http://www.tt-forums.net/viewtopic.php?p=666637#p666637 <- i summarised the compression thingie some time ago
<Webster> Title: Transport Tycoon Forums View topic - [8bpp] Graphics Replacement Project - OpenGFX (at www.tt-forums.net)
<Yexo> if nml became real smart it could try both TILE and COMPRESSED and see which one results in a smaller output
<frosch123> file size is the only thing you can archieve with ottd there :)
<Yexo> I'm not interested at all in drawing speed for ttdpatch
<Hirundo> So I guess, we should remove all of those except the cropping
<frosch123> if you can detect which sprites are used as parent sprites in spritelayouts, then you can also automatically set the crop bit
<frosch123> though it is needed for base graphics and action 5/a stuff of course
<frosch123> hmm? do you refer to the CROP bit?
<Yexo> no, the other bits
<Yexo> <frosch123> though it is needed for base graphics and action 5/a stuff of course <- what exactly is needed?
<frosch123> only the CROP :)
Change #2370: only the NOCROP bit is still valid in the 'compression type' real sprite flag. The best compression type is now automatically detected